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Learning Spring Boot 2.0

You're reading from   Learning Spring Boot 2.0 Simplify the development of lightning fast applications based on microservices and reactive programming

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781786463784
Length 370 pages
Edition 2nd Edition
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Author (1):
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Greg L. Turnquist Greg L. Turnquist
Author Profile Icon Greg L. Turnquist
Greg L. Turnquist
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Table of Contents (11) Chapters Close

Preface 1. Quick Start with Java FREE CHAPTER 2. Reactive Web with Spring Boot 3. Reactive Data Access with Spring Boot 4. Testing with Spring Boot 5. Developer Tools for Spring Boot Apps 6. AMQP Messaging with Spring Boot 7. Microservices with Spring Boot 8. WebSockets with Spring Boot 9. Securing Your App with Spring Boot 10. Taking Your App to Production with Spring Boot

Querying by example

So far, we've built up several reactive queries using property navigation. And we've updated ImageService to reactively transform our queried results into operations needed to support our social media platform.

But something that may not be apparent in the design of our data API is the fact that our method signatures are tied to the properties directly. This means that if a domain field changes, we would have to update the queries, or they will break.

There are other issues we might run into, such as offering the ability to put a filter on our web page, and letting the user fetch a subset of images based on their needs.

What if we had a system that listed information about employees. If we imagined writing a finder that lets a user enter firstName, lastName, and age range, it would probably look like this:

    interface PersonRepository 
     extends...
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